Unmanned Undersea Vehicles

UUVs have taken on a number of roles in the navies around the world, including hydrographic reconaissance, mine countermeasures, and oceanographic survey. The U.S. Navy generally classifies UUVs in four categories according to weight and diameter:

8 November 2012 - Quadrotor swarm experiments have produced some interesting results,
including potential for future military applications. Now some researchers in
Germany are working to transition these concepts to the underwater realm.